Touch display device and operating method thereof

Abstract

There is provided a touch display device including a display and a touch control device. The display includes a glass substrate. The touch control device is attached to the glass substrate and includes a touch zone, a fingerprint detection zone and a control circuit. The touch zone includes a matrix of first detecting cells arranged at a first grid distance. The fingerprint detection zone includes a matrix of second detecting cells arranged at a second grid distance. The control circuit is configured to control detection operations of the touch zone and the fingerprint detection zone and to adjust an effective grid distance of the fingerprint detection zone according to a first detected touch position.

What is claimed is: 
     
       1. A touch device comprising:
 a substrate; and 
 a touch control device attached to the substrate and comprising:
 a touch zone comprising a matrix of first detecting cells coupled at a first grid distance along a direction parallel to a surface of the substrate; 
 a fingerprint detection zone comprising a matrix of second detecting cells coupled at a second grid distance and a third grid distance along the direction parallel to the surface of the substrate, wherein the third grid distance is larger than the second grid distance; and 
 a control circuit configured to initially control detection operations of the touch zone and the fingerprint detection zone by coupling the matrix of the first detecting cells with the first grid distance and the matrix of second detecting cells with the third grid distance, and then configured to control the detection operation of the fingerprint detection zone by coupling the matrix of second detecting cells with the second grid distance when a touch position is firstly detected in the fingerprint detection zone. 
 
 
     
     
       2. The touch device as claimed in  claim 1 , wherein the substrate forms a display, and the display comprises an image display zone to which the touch zone and the fingerprint detection zone are arranged opposite. 
     
     
       3. The touch device as claimed in  claim 2 , wherein the control circuit is formed on the substrate by chip-on-glass technology or chip-on-film technology, and is opposite to a region outside of the image display zone. 
     
     
       4. The touch device as claimed in  claim 3 , wherein the control circuit is stripe-shaped and has a length direction, and the control circuit is arranged to exceed an edge of the touch zone by a predetermined distance along the length direction. 
     
     
       5. The touch device as claimed in  claim 1 , wherein when identifying that the firstly detected touch position is at the touch zone, the control circuit controls the fingerprint detection zone to perform the detection operation by the third grid distance. 
     
     
       6. The touch device as claimed in  claim 1 , wherein when identifying that successive touch positions enter the fingerprint detection zone from the touch zone, the control circuit controls the fingerprint detection zone to perform the detection operation by the third grid distance. 
     
     
       7. The touch device as claimed in  claim 5 , wherein the third grid distance is smaller than or equal to the first grid distance. 
     
     
       8. An operating method of a touch device, the touch device comprising a touch zone and a fingerprint detection zone, and a first grid distance between coupled first detecting cells of the touch zone being larger than a grid distance between coupled second detecting cells of the fingerprint detection zone, the operating method comprising:
 identifying a firstly detected touch position by coupling the second detecting cells with an initial grid distance and coupling the first detecting cells with the first grid distance; 
 controlling the fingerprint detection zone to perform a fingerprint detection by coupling the second detecting cells with a smallest grid distance, which is smaller than the initial grid distance, when the firstly detected touch position is at the fingerprint detection zone; and 
 controlling the fingerprint detection zone to perform a touch detection by coupling the second detecting cells with an effective grid distance, which is larger than the smallest grid distance and smaller than or equal to the initial grid distance, when the firstly detected touch position is at the touch zone, 
 wherein the first grid distance, the grid distance, the initial grid distance and the smallest grid distance are along a direction parallel to a surface of the touch zone and a fingerprint detection zone. 
 
     
     
       9. The operating method as claimed in  claim 8 , further comprising:
 controlling the fingerprint detection zone to perform the touch detection by coupling the second detecting cells with the effective grid distance when successive touch positions enter the fingerprint detection zone from the touch zone. 
 
     
     
       10. The operating method as claimed in  claim 8 , wherein the initial grid distance is smaller than or equal to the first grid distance of the touch zone. 
     
     
       11. A touch device comprising:
 a substrate having an image display zone; and 
 a touch control device attached to the substrate and opposite to the image display zone, the touch control device comprising:
 a plurality of first transparent electrodes extending along a first direction parallel to a surface of the substrate; 
 a plurality of second transparent electrodes extending along a second direction parallel to the surface of the substrate, wherein pitches between two adjacent first transparent electrodes and between two adjacent second transparent electrodes are first pitches; 
 a plurality of third transparent electrodes extending along the first direction and arranged opposite to a part of the image display zone and between at least two of the first transparent electrodes; 
 a plurality of fourth transparent electrodes extending along the second direction and arranged opposite to the part of the image display zone and between at least two of the second transparent electrodes, wherein pitches between two adjacent third transparent electrodes, between adjacent third and first transparent electrodes, between two adjacent fourth transparent electrodes and between adjacent fourth and second transparent electrodes are second pitches, and the second pitches are smaller than the first pitches; and 
 a control circuit
 initially coupled to the first transparent electrodes and the second transparent electrodes, and 
 then coupled to the first transparent electrodes, the second transparent electrodes, the third transparent electrodes and the fourth transparent electrodes when a touch position is firstly detected in the part of the image display zone. 
 
 
 
     
     
       12. The touch device as claimed in  claim 11 , wherein the control circuit is stripe-shaped and has a length direction, and the control circuit is arranged to exceed an edge of the image display zone by a predetermined distance along the length direction. 
     
     
       13. The touch device as claimed in  claim 11 , wherein the control circuit is formed on the substrate and selectively coupled to the third transparent electrodes and the fourth transparent electrodes by controlling a plurality of thin film transistors, wherein the control circuit is formed on the substrate by chip-on-glass technology or chip-on-film technology, and the thin film transistors are formed on the substrate by photolithography. 
     
     
       14. The touch device as claimed in  claim 13 , wherein when identifying that the firstly detected touch position is outside of the part of the image display zone overlapping the third transparent electrodes and the fourth transparent electrodes, the control circuit is not coupled to the third transparent electrodes and the fourth transparent electrodes via the thin film transistors. 
     
     
       15. The touch device as claimed in  claim 13 , wherein when identifying that the firstly detected touch position is inside of the part of the image display zone overlapping the third transparent electrodes and the fourth transparent electrodes, the control circuit is coupled to the third transparent electrodes and the fourth transparent electrodes via the thin film transistors. 
     
     
       16. The touch device as claimed in  claim 13 , wherein when identifying that successive touch positions enter inside of the part of the image display zone overlapping third transparent electrodes and the fourth transparent electrodes from outside of the part of the image display zone, the control circuit is not coupled to the third transparent electrodes and the fourth transparent electrodes via the thin film transistors. 
     
     
       17. The touch device as claimed in  claim 1 , wherein the control circuit is configured to change the coupling of the matrix of second detecting cells from the third grid distance to the second grid distance through switching devices. 
     
     
       18. The touch device as claimed in  claim 1 , wherein the control circuit is configured to change the coupling of the matrix of second detecting cells between the third grid distance and the second grid distance by connecting and disconnecting some of the second detecting cells with the control circuit.